IDOC TO FILE Scenario -> No Message arrive at PI

Hello,

i want to create a IDoc to File scenario. I already sent an IDoc from an ERP System to the PI.

The status text is ::000 and the information is 'IDoc sent to SAP system or external program'.

In the PI i have a Business System that shoud receive this IDoc but i can't find an incoming Message for example in the message monitor???

Somebody have an idea?

Thank you!